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. 1986 Nov;83(21):8044–8048. doi: 10.1073/pnas.83.21.8044

Location of regulatory elements responsible for drug induction in the rat cytochrome P-450c gene.

K Sogawa, A Fujisawa-Sehara, M Yamane, Y Fujii-Kuriyama
PMCID: PMC386863  PMID: 3464941

Abstract

The synthesis of cytochrome P-450c is induced remarkably in cultured cells as well as animal tissues in response to added chemicals such as 3-methylcholanthrene and 2,3,7,8-tetrachlorodibenzodioxin. To study this mechanism, we joined the sequence of 5'-flanking and upstream regions of the P-450c gene to the structural gene for chloramphenicol acetyltransferase. The fusion gene was introduced into Hepa-1 cells for the assay of the expressed acetyltransferase activity. At least three cis-acting regulatory regions that are responsible for the inductive expression were determined in the sequences from nucleotide -3674 to -3067, from -1682 to -1429, and from -1139 to -1029, relative to the transcription start site, by external deletion analysis. Further detailed analysis of the region (nucleotides -1139 to -1029) most influential on the inducibility revealed that a regulatory element consisting of 10 base pairs termed a drug regulatory element (DRE) and its homologues were tandemly arranged in this region. The consensus sequence deduced from DREs is 5'-GCNTGAGGCTGGG-3'. The regulatory sequence from nucleotide -1140 to -844 is capable of conferring inducibility on a heterologous promoter in a manner independent of its orientation and distance from the subordinate promoter.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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